Rotor system for condensers



May 4,1926. 1,583,499

P. M. SMITH El AL ROTDR SYSTEH FDR CONDENSERS Filed April 28. 1924 A r rom/f v.

Patented May 4, 1926.

UNITED STATES insana Pai-sur orales.

PRESTON M. SMITH, OF EAST ORANGE,` AND EDWARD M. SQUARE'Y, SOUTH ORANGE,vr NEW JERSEY, ASSIGNORS TO U. S. TOOL COMEANY, ING., A CORPORATION OF NEW JERSEY.

Application filed Aprill as,

To all whom t may concern.'

Be it known that we, Pnns'roN M. SMITH, a citizen ofthe United States, and EDWARD M. SQUAREY, a citizen of the Commonwealth of Newfoundland, and residents, respectively, of East Orange and South Orange, county of Essex, and Statie of New Jersey, have invented a new and useful Improvement inRotor Systems for Condensers, of which thel following is a specification.

In the construction and use of themodern variabl-e condenseras an accessory in radiotelephony, many difficulties have arisen in the way of capacitv losses of such a nature as often to render an otherwise valuable instrument useless. These losses, when handling the very weak electric currents to which the instrument is adapted, are hard to trace to their exact source, and when found, the conditions are such as to be almost incapable of remedy without great expense and much trouble. After many tests, we find that many of the losses are traceable, not so much to the material of which the instrument is constructed as to imperfect contact of metal to metal-in the plate connections. We have, therefore, designed an improved form of rotor, wherein the several plates forming it are integrally connected, so as to comprise a single integral metallic strip from one end of the plate system to the other, thereby making the conductor homogeneous throughout.

The object of our invention, therefore, is to provide a rotor for a variable condenser with a plate system which is continuous, whereby the capacity losses therein may be reduced to a minimum, and that minimum so infinitesimal as to be incapable of measurement.

In the accompanying drawing forming a part hereof, we have shown an embodiment of our improvement, wherein Fig. l is a plan of a strip of sheet metal, showing the layoutof a series of connected rotor plates.

Fig. 2 is a rear edge view of a set of the plates in their folded form.

Fig. 3 is a front edge view of the same.

Fig. 4t is a side view of an assembled rotor.

Similar reference numerals refer to like parts throughout the specification and drawin 2('glhe strip of sheet metal 1 is selected of a width sufcient to stamp the rotor plates :aofron SYSTEM non connnivsnns.

1924. serial No. 709,394.

therefrom, but of only one-half the usual thickness or` gage of such plates. The plates '2' are eut or punched from the strip of metal the plates, and have the apertures 6 therethrough, by vwhich the` plates are assembled upon the rotor shaft 7, upon which they are clamped between the usual collar 8 and the nut 9? lhen a complete set of the plates is stamped from the metal strip, they are folded across the tangs 3 along the dotted lines, and doubly folded across the tangs 4.-, into the form shown in Figs. 2 and 3. The tangs 3 are short, and when folded, the backs of the plates which they connect are brought back to back iu continuous contact throughout. The tangs 4t are of a length sufficient, when folded or bent as shown, to afford the requisite space between the plates to permit the proper interleaving with the plates of the condenser stator (not shown).

The series of plates thus connected together are then assembled upon the shaft 7, with the spacing washers l0 between adjacent plates, and clamped as above described. between the fined collar 8 and the clamping nut 9. It is then ready for assembly in thc complete condenser.

If desired, the end plate of the series may be provided with a long tang ll, which is bent around and over the collar 8, and extends along a groove in the side of the shaft 7, to a point outside of the condenser frame (not shown) for connection with the usual pig-tail to the outside circuit, the purpose being to afford a continuous homogeneous metal connection between the entire rotor plate system and the external circuit.

The rotor system t-hus described is designed especially for use in connection with the stator plate system described in the application of Edward M. Squarey, Frederick Koch and Alwyn E. Borton, Serial No. 709,395 filed of even date herewith, and to which reference is made.

The making of the rot-or plate system from sheet metal of but half that usually employed enables us to preserve the usual thickness of the individual plates, since when the connected plates are folded as described.

the resulting duplex plates are only of such usual thickness. The metal being continuous from one end of the plate system to the other, completely obviates the capacity losses which are invariably found to be present in condensers wherein the plates are clamped together in mere metallic contact. In other words, We provide a continuous homogenel` ous metallic plate system.

l. A rotor plate system for variable plate condensers comprising a plurality of plate members, arranged in parallel spaced relation, each plate member being composed of two plates integrally connected upon their arcuate edges and folded thereat back to back in continuous contact, and each connected by an integral tang to the next adj acent plate member.

2. A rotor plate system for variable condensers, comprising a plurality of sheet metal plates of semicircular shape arranged in pairs, each pair being connected together by an integral tang at their arcuate edges and folded thereat back to back to form a sheet metal and arranged in pairs having their arcuate edges adjacent to each other` and integrally connected by short tangs7 the straight edge of each plate being connected by-an integral tang to the straight edge of the adjacent plate of the next adjoining pair ol plates, whereby When said pairs ot vplates are folded back to back across said first named tangs and doubly foldedacross said second-named tangs, a plurality of dupleX plate members arranged in parallel spaced relation is formed.

PRESTON M. SMITH. EDVARD M. SQUAREY. 

